https://blog.faceutil.com/2017/04/20/%ec%8a%a4%ed%83%80%ed%81%ac%eb%9e%98%ed%94%84%ed%8a%b8-%ec%9c%a0%ec%a6%88%eb%a7%b5-%eb%9e%9c%eb%8d%a4%ec%95%a0%eb%8b%88%eb%b0%a9%eb%93%a4%ec%96%b4%ea%b0%80%ea%b8%b0-starcraft-use-map-entering-random-a/